Leases - Additional Information (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Leases [Line Items]
Operating lease, right-of-use asset	$ 100,000					$ 100,000
Lessee operating lease, discount rate	5.00%					5.00%
Right-of-use asset, operating lease costs	$ 38,000					$ 100,000
Short-term lease costs	100,000					200,000
Rental revenue	15,728,000	$ 16,390,000	$ 8,622,000	$ 10,720,000	$ 25,012,000	40,740,000	$ 32,414,000
Future minimum lease payments to be received	7,200,000					7,200,000
Lease receivables from customers, net of reserves	$ 10,100,000					$ 10,100,000
Maximum
Leases [Line Items]
Lease term	6 months					6 months